The 2115QTiMAX delivers best in class performance for a tool less than six inches long and weighing less than two and a half pounds. The minimal size of this tool will allow greater access to tight spaces, while the minimal weight will reduce operator fatigue...alll while still delivering MAX performance in a quiet tool. Free speed: 15,000 RPM, 1500 BPM, sound dBa: 93.2, minimum hose size; 3/8", average air consumption: 4 cfm.